What was the significance of the Russian Revolution of 1917 for World War I and world history?

• A. It had little impact on WWI's outcome.
• B. It ended Russia's participation in WWI and sparked global communist movements, reshaping 20th-century geopolitics.
• C. It strengthened the tsarist government's control.
• D. It caused Russia to join the Central Powers again.

Answer: (B)

The essential point is that the Russian Revolution reshaped both a major war and the broader world by moving Russia out of World War I and igniting ideological change that spread far beyond Europe. When the Bolsheviks took power in 1917, Russia signed a separate peace with the Central Powers, exiting the war. This freed German forces to focus on the Western Front, altering military calculations and contributing to the dynamic struggles on the battlefield. At the same time, the new Soviet government prioritized its own revolutionary goals at home and did not pursue Allied war aims, which changed how the Allies faced the remaining conflict and the postwar period.

For world history, the ripple effects were profound. The emergence of the Soviet Union created a permanent, ideologically based rival to capitalist democracies, fueling global debates, alliances, and movements for decades. The experience inspired communist parties and revolutionary movements around the world, influenced decolonization, and anchored a long-lasting geopolitical split that shaped international relations long after World War I ended.

This is why the other statements don’t fit: the revolution did not leave WWI largely unchanged, nor did it strengthen the tsarist regime or lead Russia to rejoin the Central Powers.